[MM-63007][MM-63004][MM-63020][MM-63009][MM-63008] More accessibility fixes around Search (#31409)

* [MM-63008] Make collapse button on search bar an actual button

* [MM-63004][MM-63020] Convert search box to floating-ui, fix some of the roles and labels that were incorrect

* [MM-63009] Add radiogroup and radio roles to the search box types

* [MM-63007] Ensure search box reads out number of results with suggestion items

* Fix playwright tests

* PR feedback

* Remove floating ui overlay

* Remove unnecessary .first() by being more specific about the search box

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Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/cypress/tests/integration/channels/files_and_attachments/disabled_file_upload_spec.js

@@ -72,7 +72,7 @@ describe('Upload Files - Settings', () => {
         cy.get('#searchHints').find('.search-hint__search-type-selector button > .icon-file-text-outline').should('not.exist');
 
         // # Search for posts
-        cy.uiGetSearchBox().first().type('sample').type('{enter}');
+        cy.uiGetSearchBox().type('sample').type('{enter}');
 
         // * Verify search results do not have File button
         cy.get('.files-tab').should('not.exist');